Effects of flow-induced vibration on forced convection heat transfer from two tandem circular cylinders in laminar flow

Flow-induced vibrations (FIVs) and forced convection heat transfers of two tandem circular cylinders in laminar flow with Re=150 and Pr=0.7 are investigated using fluid-structure interaction (FSI) simulation. The cylinder is heated, elastically supported and only allowed to vibrate in the transverse direction, with the mass ratio, damping ratio, centre-to-centre distance fixed respectively at m*=2, ζ=0, L/D=4 and the reduced velocity varied in Ur=1~20. The two-dimensional incompressible Navier-Stokes equations and energy equation are coupled with the vibrating equation of the spring-mass-damper model to describe FIV of two tandem cylinders involving forced convection heat transfer process. An FSI solver is proposed by combing the modified characteristic-based split scheme, dual-time stepping method, segment spring analogy method and loosely coupled partitioned approach, the accuracy and stability of which are validated using two benchmark models including the forced convection heat transfer from a fixed circular cylinder and FIV of an elastically supported circular cylinder. Using FSI simulation, characteristics of FIVs and their effects on forced convection heat transfers of two tandem circular cylinders are analyzed in detail. The obtained numerical results are insightful to the understanding of the heat transfer features of a group of cylindrical structures under FIVs, such as the tube bundles in heat exchangers and power plants, fuel rod bundles in nuclear reactors and riser system in offshore oil and gas platforms.